Ore detector



May 12, 1925.y

H. 1'. iF. LUNDBERG E'r Al.

ons DETECTOR Flei Jan. 24, 1919 2 S'heets-Shee'.v 1

. h I. Y .hvanorhw H. TF Lun/DBMS. H. NAT/1095.71'

May 12, v1925. 1,537,360

H. T. F. LUNDBERG ET Al.

om: DETEToR v Filed Jan. 24,19;9 2 Sheets-Sheet 2 -HQ7`FLUNDBER-G H. IH, NATHos-r Patented May 12, 1925.

PATENT' OFFICE.

' HANS' TORKEL rnnnnrx LUNDBERG, or LIDINGO 'vILLAsTAn AND HARRY JOHAN. Huma NATHORs'r, or STOCKHOLM, SWEDEN, AssIGNOBs rro AKTIEBOLAG'ET nnnx'rnrsx MAL'HLETNING, or STOCKHOLM, SWEDEN, -A CORPORATION on" SWEDEN'.

onn' DETECTOR.

Application led January 24, 1919. Serial' No. 272,808.

' To all lwhom t may concern: l

Be it known that we,4 HANS Tommi. FREDRIK LUNDBERG and HARRY JOHAN HJALMAR NATHORST, subjects of the King of Sweden, and residents, respectively, of Li-v dingo Villastad and Stockholm, both in the Kingdom of Sweden, have invented a new and useful Improvement in Ore Detectors,

of which the followingis a specification.

The' present invention relates to an apparatus for -discovering and determining electrically the location of veins of ore or mineral. The electrical method of locating ores as at resent in use, may be said to be, in the main, a simplification and improvement on the well known method of Daft and Williams. According to this method `.two-

' primary electrodes contacting with the soil are used, which electrodes are connected to a source of electric current, and two secondary electrodes or so-called4 searching rods connected to a sensitive receiving apparatus,

for instance a telephone receiver or a galvanometer, the said .searching rods being placed in contact with the soil at different points between the primary electrodes in order in this manner to ascertain any disturbances in the lines of current between the primary poles due to veins of ore possibly I0 present in the soil.l The improvement on the said method hitherto made consists 4 chieiiy in this that instead of directly following 'the lines of current and determining the location of the ore by the disturbances 85 in saidl lines of current, the equipotential curves areV followed whereby the method becomes more objective and thus less dependent on the person making the searchl In the accompanying-drawing Fig. 1 is a 40 view illustrating dia method above referred to. Fig. 2 is a diagrammatic view 'illustrating one embodiment of the present invention, and Fig. 3 is' mmatically the man-' ner of locating a vein' of ore by the known' equipotential curves after `every such rej moval, it is possible from the disturbances appearing in respect to these curves to obtain an approximate imageoithe location of the vein of ore indicated inl the drawing by the shaded surface. The-said removals of the primary electrodes, however, must be made with' a certain discrimination, which fact reduces theobjectivi'ty of the method and the carrying out of the method becomes in this manner both'circumstantial and timewasting. A Afurther imperfection of the method is of course also the fact that 'the results obtained by diierent placings of the two primary electrodes cannot be mutually connected in any manner, or, in other words, that it is only possible in an exceedingly small number of cases b y vmeans-'of a single placing of the primary electrodes to olotain an idea of the extension of the vein o ore.

The purpose of the apparatus forming the subject of the present invention is to avoid the said inconveniences. The `apparatus in question consists broadly-in this that oneof the primary electrodes or both'primary -electrodes have a considerable extension in a horizontal direction in proportion tothe distance between said primary electrodes, so

that they contact with the soil either along a'continuous Straight Or curved line or at a plurality of points on such a line. In this manner the result is attained that the-equipotential lines do not form circles in which there will be greater or smaller disturbances due to the influence' of the ore,but that it is possible to Obtain another more suitableshape of the said linesand also toy extend .their lengths,` as required. The most advantageous shape of the equipotential lines for making observations along a vein ofvore f is probably in most cases the straight line,

either by .contact- .95 when it will bepossible to make 'a continua great number of solitary points as shown in respect of the electrode A. The electrodes are also connected with a source of current,

' the ground -,until it arrives at a point where nected to said secondary electrodes,yof dif there is no indication in the receiver H conference of potential between the pointsof contact with the soil of the electrodes F and G. If again there is an ore in the vicinity of the current-conducting region, the disturbances caused by the ore will be easily detected. It will be understood from Fig. 2 that in such case the location of a vein of ore may be fully determined by a single placing of the primary electrodes.

V The local conditions may of course sometimes be such that only one of the primary electrodes can obtain a considerable linear extension, while the other electrode must be olar. In such case the result will probably e somewhat more difficult to interpret, but

30.also in ,this case a-considerable improvement will be obtained. l v

Fig. 3 in the' accompanying drawings shows an embodiment of the invention having a polar electrode K and an electrode L having a considerable extension in horizontal direction and consisting, for instance, of van electricall conductin wire placed in contact with t e soil. Sai electrodes K and L are connected 'to a source M of alternating trodes adapted to be .brought into contact with the soil and connected with a source of electric current, at least one of said primary electrodes having a considerable extension in a horizontal direction in proportion to the distance between said primary electrodes, and two secondary electrodes connected with 'a sensitive receiving apparatus andada ted `to be brought into contact with the s'o1l at diere'nt points between the primary elec? trodes'. Y

2. Apparatus for discovering andl determining electrically the location of veins ot' ore or mineral, comprising two primary electrodes adapted to be brought into contact with the soil and connectedwith :a source of electric current, said primary electrodes hai# i-ng a considerable ,extension in a horizontal vdirection in proportion to the distance between said4 primary electrodes, and two secondar electrodes connected with a sensitive receiving apparatus and adapted to be brought into contact with the -soil at different points between the primary electrodes.

l 3. Apparatus for discovering and determining electrically the location of 4veins of ore or mineral, comprising two primary electrodes adapted to be brought into,- contact with the soil and connected with a 'source of alternating current, at least one of said primary electrodes having a considerable extension in a horizontal direction in proportion to the distance between said primary elecnected with a sensitive receiving apparatus Vand adapted' to be brought into` contact with the soil at di'erent points betweenthe primary electrodes.

4. Apparatus for discovering and' determining electrically the location of veinsr of ore or mineral, comprising two primary electrodes adapted to be brought into contact with the-soil and connectedwith a source of electric current, at least one of said primary electrodes having a considerable extension in a horizontal direction in proportion to the distance between said primary electrodes, and a secondary circuit including a sensitive receiving apparatus and located between said primary electrodes.

5. Apparatus for discovering land determining electricall ythe location of vveins of ore. or mineral, w ich includes an elongated electrode adapted to be horizontally disposed when in operative position and to be brought into contact with the soil while arranged substantially parallel thereto.

6. Apparatus for discovering and determining electricallyY the location of veins of ore or mineral comprising, a primar circuit, a source of current for said prlmary circuit, Va secondary circuit, and an indicator` connected with said secondary circuit, said primary circuit including an elongated electrode adapted to be horizontally disposed 'when in operative positionand to be brought into contact with the soil while arranged substantiallyl parallel thereto.

' HANS TORKEL FREDRIK L UHDIERG.

anar :om :um samenst. i 

